Included are three themes, which are named CenterSageNarrow, CenterSage, and CenterSageWide. They are aimed at TV's with different overscan behavior. The only differences between the three are in the background images. Just play with them and you will figure out which works best for your TV.

Also included are two .layout files, one for the main menu and one for dynamic sub menus. You will have to tweak them a little to get them just right on your TV set, but it should be small location and sizing tweaks. The basic look and feel is there.

Credits :

Main Menu Look and Feel : CenterStage : The Mac Media Center Project.
Main Menu Icons : CenterStage : The Mac Media Center Project.
Online Services Icon : modified version of the Online Services icon in microb81's theater icon pack (added shadow and modified the color).
Base Theme - started with the iTV theme for SageMC. For resources I didn't modify, it's the iTV version of the resource.

I'm looking at the theme properties file and do not see any other background images mapped (besides the dynamic menu one). Is the intent if we want to use the provided alternate background, we just go in and define what screens we want to assign it to?

So by default all themes use background.jpg as the background for all screens. So on CenterSage I have this defined as the screens you see everywhere except for the Dynamic Menus. The dynamic menu I over-ride in the theme.properties file to use the main_background.jpg, which has the spot light on a stage effect.

Does that answer your question? To get this theme looking like it does in the screen shots above you shouldn't have to do anything other than loading the theme.

The only caveat to that is that if you have gone in through settings and specified your own background, you have to clear that one first before the theme background will be used.

Just in case anyone runs into the same issue - When I first imported the layout and selected the theme, the background on the main menu was not the correct 'spotlight' background, but the alternate background used for the other menus. I had to switch to using dynamic menus in order to get things looking right.